JP2003175515A - Reinforcing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing method improved in reinforcing properties, workability, productivity and economical efficiency, that is, a reinforcing/ repairing method related to reinforcement/repairing due to a prepreg, forming no gap with respect to a substrate material and capable of keeping the tack strength of the prepreg to stick and fix the prepreg to a rising surface or a ceiling surface. <P>SOLUTION: A resin composition (a) containing a polymerizable oligomer and/or a polymer (A), a polymerizable monomer (B), a thixotropic agent (C) and a polymerization initiator (D) or a curing accelerator (E) as essential components is applied to the substrate material and a fiber reinforced resin sheet (b) containing a polymerizable oligomer and/or a polymer (F), a polymerizable monomer (G), a photopolymerization initiator (H), a thickener (J) and a fiber reinforcing material (K) as essential components is laminated to the resin composition layer and the whole is irradiated with active rays through the fiber reinforced resin sheet to be cured. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to the reinforcement and repair of wood, metal, plastic, FRP, concrete, etc., while using a photo-curable fiber-reinforced resin sheet excellent in curability and handleability as a base material. The present invention relates to a reinforcing method for obtaining an excellent adhesive force by removing air bubbles that intervene and securing an adhesive area.

[0002]

2. Description of the Related Art As a method of reinforcing and repairing with FRP, a method of laminating FRP layers by a hand lay-up method or a spray-up method is generally known.

However, these techniques have some disadvantages. For example, since a liquid unsaturated resin is used, there are problems of low productivity such as deterioration of working environment due to odor and requiring manual work and long curing time.

On the other hand, Japanese Patent No. 1612602
(H7.4.26 right deletion), JP-A-56-13953
5, JP-A-10-58465, JP-A-10-6786
5, JP-A-10-71661, JP-A-10-33134
5, JP-A-11-43596, and JP-A-2000-2197.
93, JP 2000-280385 A, JP 2000-3
34852 and the like describe that a prepreg cured by ultraviolet rays and visible light is useful in terms of workability and working environment.

However, such a prepreg has a drawback that the moldability to the base material is remarkably lowered as compared with the liquid curable resin, and it is expected to be reinforced and repaired due to the drawback that a void is formed between the base material and the prepreg. There is a problem that the performance to be achieved cannot be achieved. Also, by applying a liquid adhesive resin between the base material and the prepreg, it is possible to remove voids, but the adhesive resin flows out on the surface such as the standing surface or the ceiling, and the adhesive strength is significantly reduced. However, in practice, the prepreg cannot be fixed. In addition, when the surface of the base material has irregularities, it becomes difficult to make it smooth by applying the liquid adhesive resin to a surface such as a standing surface or a ceiling.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is a reinforcing method having improved reinforcing properties, workability, productivity and economic efficiency. That is, regarding the reinforcement / repair with a prepreg, it is to provide a reinforcement / repair method that does not form a gap between the base material and can maintain the adhesive force and can be adhesively fixed to a standing surface or a ceiling surface.

[0007]

Means for Solving the Problems As a result of intensive studies on these problems, the present inventors have found that a thixotropy-imparting curability is imparted before a fiber-reinforced resin sheet having photocurability is formed on a substrate. The present invention has been completed by applying a resin composition.

That is, the present invention provides that a polymerizable oligomer and / or polymer (A), a polymerizable monomer (B), a thixotropic agent (C) and a polymerization initiator (D) or a curing accelerator (on a substrate). The resin composition (a) containing E) as an essential component is applied, and then a polymerizable oligomer and / or polymer is applied.
(F), polymerizable monomer (G), photopolymerization initiator (H), thickener (J)
And a fiber reinforced resin sheet (b) containing the fiber reinforced material (K) as an essential component, and further irradiating the fiber reinforced resin sheet with an actinic ray to cure the resin. Next, the present invention will be described in detail.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION To briefly describe the features of the present invention, a resin composition obtained by imparting thixotropy to a resin that can be cured even at room temperature such as ultraviolet and visible light or redox curing is provided on a surface of a substrate. After coating, a fiber reinforced resin sheet (sheet-shaped prepreg) in which a fiber reinforced material is impregnated with a photo-curable resin is adhered and fixed, and then this is rolled by a roll or an FRP type to a low pressure of 0.1 to 10 kg / cm ² . In order to reinforce and repair the base material with fiber reinforced resin, it is pressure-bonded, shaped, and cured by ultraviolet rays and visible light.

In the reinforcing method of the present invention, the base material is not particularly limited, but one having a non-uniform surface is preferable,
Examples include concrete, mortar, wood and stone. In particular, the reinforcing method of the present invention can be applied to repairing defective parts such as cracks in concrete articles, that is, concrete inner walls in tunnels and concrete walls of buildings.

In the present invention, a polymerizable oligomer and / or
Or polymer (A), polymerizable monomer (B), thixotropic agent (C)
Then, the resin composition (a) containing the polymerization initiator (D) or the curing accelerator (E) as an essential component is applied onto the substrate. Examples of the polymerizable oligomer and / or polymer (A) include unsaturated polyester, vinyl ester, acrylic,
Alternatively, vinyl urethane or the like may be used.

The unsaturated polyester of the oligomer and / or polymer (A) in the present invention is not particularly limited, and a known unsaturated polyester which is conventionally used for general unsaturated polyester resin moldings can be used. it can. The unsaturated polyester is obtained from an α, β-unsaturated carboxylic acid or an α, β-unsaturated carboxylic acid optionally containing a saturated carboxylic acid and an alcohol.

Examples of the α, β-unsaturated carboxylic acid include fumaric acid, maleic acid, maleic anhydride, itaconic acid, citraconic acid, mesaconic acid, chloromaleic acid, and dimethyl esters thereof.
These α, β-unsaturated carboxylic acids may be used alone or in combination of two or more.
Examples of the saturated carboxylic acid include phthalic acid, phthalic anhydride, isophthalic acid, terephthalic acid, het acid,
Hexahydrophthalic anhydride, adipic acid, sebacic acid,
Azelaic acid and the like can be mentioned. These saturated carboxylic acids may be used alone or in combination of two or more.

On the other hand, as the alcohol, for example, ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, triethylene glycol, 1,3-butanediol, 1,4-butanediol, 1,3-pentanediol, 1, 6-hexanediol, cyclohexanediol, neopentyl glycol, 2,2,4-trimethyl-1,3-pentanediol, glycerin monoallyl ether, hydrogenated bisphenol A, 2,2-bis (4-hydroxypropoxyphenyl) ) Propane, diols such as 2,2-bis (4-hydroxyethoxyphenyl) propane, triols such as trimethylolpropane, and tetraols such as pentaerythritol. These alcohols may be used alone or in combination of two or more.

The vinyl ester of the oligomer and / or polymer (A) in the present invention is most typically produced by reacting an epoxy resin with acrylic acid or methacrylic acid. It contains a polybutadiene type vinyl ester produced by the reaction of terminal carboxy polybutadiene and glycidyl methacrylate, and is a group of resins excellent in corrosion resistance and mechanical strength.

The acryl of the oligomer and / or polymer (A) in the present invention means a thermoplastic polymer and a polymerizable monomer derived from a polymerizable monomer containing methacrylic acid ester and acrylic acid ester as a main component. It is composed of Monomers used in the polymer are methyl (meth) acrylate, ethyl (meth) acrylate,
Propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, cyclohexyl (meth) acrylate, etc., are essential components of (meth) acrylate, and if necessary, the above It is obtained by using another polymerizable monomer that is copolymerizable with the (meth) acrylic acid ester in combination and polymerizing the monomer mixture.

The vinyl urethane of the oligomer and / or polymer (A) in the present invention is a urethane oligomer having an acryloyl group, which is obtained from polyols, isocyanates and hydroxyl group-containing (meth) acrylates.

Examples of the polymerizable monomer (B) of the resin composition (a) include aromatic monomers such as styrene, α-methylstyrene, vinyltoluene, paramethylstyrene and chlorostyrene, and hydroxyethyl which is a functional monomer. (Meth) acrylate, hydroxypropyl (meth)
A hydroxyl group-containing monomer such as acrylate or hydroxybutyl (meth) acrylate, or a monomer having a carboxyl group such as (meth) acrylic acid can also be used.
Other (meth) acrylic acid esters, vinyl esters such as vinyl acetate and vinyl propionate, vinyl halide monomers such as vinyl chloride and vinylidene chloride, unsaturated nitriles such as acrylonitrile and methacrylonitrile, etc. They can be used, and a maleic acid ester and a fumaric acid ester having an alkyl group having 1 to 4 carbon atoms may be used in combination.

Further, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate,
Butylene glycol di (meth) acrylate, trimethylolpropane di (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol di (meth) acrylate, hexanediol di (meth) acrylate, oligoethylene di (meth) acrylate, etc. It is also possible to use the polyfunctional polymerizable monomer. Of these polymerizable monomers, one kind may be used, or two or more kinds may be used in combination.

The content of the polymerizable monomer (B) is not particularly limited as long as it is contained, but is preferably 10 parts by weight with respect to 100 parts by weight of the oligomer and / or polymer (A).
To 200 parts by weight, more preferably 40 to 100 parts by weight.

Thixotropic agent contained in the resin composition (a)
(C), its shape is star-shaped, needle-shaped, whisker-shaped,
It is not particularly limited to a scale-like shape, and may have any shape or shape that imparts thixotropy to a mixture of an oligomer or polymer and a polymerizable monomer. Specific examples include silica powder, talc powder, mica powder, glass flakes, metal whiskers, ceramic whiskers, calcium sulfate whiskers, asbestos, smectite and the like. If necessary, the above two or more kinds may be used in combination.

As commercially available products, Leoroseal QS series (manufactured by Tokuyama Soda Co., Ltd.), Aerosil series (manufactured by Nippon Aerosil Co., Ltd.), BENATHIX series (manufactured by Wilber Ellis company), FRANKLIN FIBER (U
SG), Talc SW, Talc SS, Talc SWE
(Manufactured by Nippon Talc Co., Ltd.), talcan powder PK, Lotarc-T (manufactured by Hayashi Kasei Co., Ltd.), Arbolex YS (manufactured by Shikoku Kasei Kogyo Co., Ltd.) and the like.

The size, particle size and amount of addition may be such that the resin composition (a) has no fluidity, and the total amount of the oligomer and polymer (A) and the polymerizable monomer (B) is 100% by weight. Preferably 1 to 30 parts by weight,
It is more preferably 5 to 10 parts by weight and determined by the thixotropic agent's ability to impart thixotropy.

Examples of the polymerization initiator (D) that can be added to the resin composition (a) include a photopolymerization initiator and a thermal polymerization initiator. Considering workability and the like, the photopolymerization initiator is included. Is preferred.

Examples of the photopolymerization initiator (D) include benzophenone, acetophenone, and derivatives thereof, and a mixture of an oligomer and a polymer (A) and a polymerizable monomer (B) can be used up to about 500 nm. A material that can accelerate the polymerization reaction by irradiation with visible light having a wavelength and light in the ultraviolet region to cure at room temperature is used. In addition, at the time of its use, additives and fillers that control viscosity, tackiness, shrinkage of impregnation molding and the like may be added within a range that does not inhibit the photoreaction.

The thermal polymerization initiator is used in combination with the photopolymerization initiator,
Ketone peroxides, hydroperoxides,
Besides diacyl peroxides, peroxyesters are used. Also when this initiator is used, the fiber-reinforced resin sheet (b) is laminated before the resin composition (b) is completely cured, and the sheet (b) is irradiated with an actinic ray and cured. .

When the polymerization initiator (D) is added, its amount is such that the oligomer and the polymer (A) and the polymerizable monomer (B) are added.
The total amount of 100 parts by weight is preferably 0.1 to 5
Parts by weight are suitable.

Examples of the curing accelerator (E) include metal soaps such as cobalt naphthenate, cobalt octenoate, vanadyl octenoate, copper naphthenate and barium naphthenate, and metal chelate compounds such as vanadyl acetyl acetate and cobalt. There are acetyl acetate and iron acetylacetonate. In addition, amines include N, N-dimethylamino-p-benzaldehyde, N, N-dimethylaniline, N, N-diethylaniline, N, N-dimethyl-p-toluidine, N-ethyl-m-toluidine, triethanol. Amine, m-toluidine, diethylenetriamine, pyridine, phenylmorpholine, piperidine, diethanolaniline and the like can also be used. One of these curing accelerators or two or more selected from them may be combined.

When the curing accelerator (E) is added, its amount is such that the oligomer and polymer (A) and the polymerizable monomer (B) are added.
Is preferably 0.01 to 100 parts by weight.
10 parts by weight is suitable. When the above curing accelerator is used instead of the polymerization initiator, the organic peroxide is mixed immediately before use.

As such organic peroxides, in addition to ketone peroxides, hydroperoxides and diacyl peroxides which are usually used as redox catalysts, peroxyesters can be used.

Examples of the ketone peroxides include methyl ethyl ketone peroxide, cyclohexane peroxide, methyl cyclohexane peroxide, methyl acetoacetate peroxide, acetylacetone peroxide and the like.

Hydroperoxides include P-
Menthane hydroperoxide, diisopropylbenzene hydroperoxide, 1,1,3,3-tetramethylbutyl hydroperoxide, cumene hydroperoxide, t-hexyl hydroperoxide, t-butyl hydroperoxide and the like can be used. .

As diacyl peroxides, isobutyl peroxide, 3,5,5-trimethylhexanoyl peroxide, octanoyl peroxide, lauroyl peroxide, stearoyl peroxide, succinic acid peroxide, m-toluoyl peroxide, m-Benzoyl peroxide, benzoyl peroxide, etc. are used.

Further, as peroxyesters, α,
α'-bis (neodecanoylperoxy) diisopropylbenzene, cumylperoxy neodecanoate, 1,
1,3,3-Tetramethylbutyl peroxy neodecanoate, 1-cyclohexyl-1-methylethyl peroxy neodecanoate, t-hexyl peroxy neodecanoate, t-butyl peroxy neodecanoate ,
t-hexyl peroxypivalate, t-butyl peroxypivalate, 1,1,3,3-tetramethylbutylperoxy-2-ethylhexanoate, 2,5-dimethyl-2,5-bis (2 -Ethylhexanoylperoxy) hexane, 1-cyclohexyl-1-methylethylperoxy-2-ethylhexanoate, t-hexylperoxy-2-ethylhexanoate, t-butylperoxy-2-ethylhexa Noate, t-butylperoxyisobutyrate, t-hexylperoxyisopropyl monocarbonate, t-butylperoxymaleic acid, t-butylperoxy-3,5,5-trimethylhexanoate, t-butylperoxy Oxylaurate,
2,5-Dimethyl-2,5-bis (m-toluoylperoxy) hexane, t-butylperoxyisopropyl monocarbonate, t-butylperoxy-2-ethylhexylmonocarbonate, t-hexylperoxybenzoate, 2 , 5-dimethyl-2,5-bis (benzoylperoxy) hexane, t-butylperoxyacetate, t-butylperoxy-m-toluoylbenzoate, t-butylperoxybenzoate, bis (t
-Butylperoxy) isophthalate and the like are used.

The amount of the organic peroxide depends on the resin composition (a) 1
0.5 to 5 parts by weight is suitable for 100 parts by weight.

The fiber-reinforced resin sheet (b) laminated on the above resin composition (b) comprises a polymerizable oligomer and / or polymer (F), a polymerizable monomer (G), a photopolymerization initiator (H). ), A thickener (J) and a fiber reinforcing material (K) are essential components.

The polymerizable oligomer and / or polymer (F), the polymerizable monomer (G) and the photopolymerization initiator (H) are the same as those mentioned in the resin composition (a). It may be the same as or different from the one used in b). The content thereof may be the same as that of the resin composition (a).

Examples of the thickener (J) include SMC and B
A metal oxide such as magnesium oxide generally used for MC, an oligomer and a difunctional or higher functional isocyanate capable of reacting with the OH group of the polymer (F) are used.
If necessary, a thermoplastic resin powder can also be used as a thickener. Their amounts are oligomers and polymers
With respect to 100 parts by weight of the total amount of (F) and the polymerizable monomer (G), those capable of reacting with metal oxides or OH groups are
Preferably 0.1 to 50 parts by weight, more preferably 0.5.
The amount of the thermoplastic resin powder is preferably 1 to 60 parts by weight, more preferably 10 to 30 parts by weight. Further, these thickeners can be used together.

When thickening is not possible with the above-mentioned metal oxides or those capable of reacting with OH groups, it is preferable to use as the thickening agent a thermoplastic resin powder as a main component instead of these. . Specific examples of such a thermoplastic resin powder include an average particle size obtained by polymerizing a polymerizable monomer by suspension polymerization or emulsion polymerization and removing water, and having an average particle size in the range of 0.1 μm to 0.5 mm. Powders such as hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate and hydroxybutyl (meth) acrylate, which are functional monomers, and (meth) acrylic acid. Etc., a monomer having a carboxyl group can also be used. Furthermore, other (meth) acrylic acid esters, aromatic monomers such as styrene, α-methylstyrene, vinyltoluene, paramethylstyrene and chlorostyrene, vinyl acetates such as vinyl acetate and vinyl propionate, vinyl chloride, Vinyl halide monomers such as vinylidene chloride,
Unsaturated nitriles such as acrylonitrile and methacrylonitrile may be used, or a copolymer in which two or more kinds of polymerizable monomers are combined may be used.

The fiber reinforcing material (K) may be one usually used as a fiber reinforcing material, for example, glass fiber, polyester fiber, phenol fiber, polyvinyl alcohol fiber, aromatic polyamide fiber, nylon fiber, carbon fiber. . Examples of these forms include chopped strands, chopped strand mats, rovings, and woven fabrics. These fiber reinforcements are selected in consideration of the viscosity of the resin composition and the strength of the resulting molded product. The content of the fiber reinforced material (K) in the fiber reinforced resin sheet (b) is preferably 1 to 50% by weight, more preferably 10 to 40% by weight.

The fiber-reinforced resin sheet (b) used in the present invention comprises a fiber-reinforced material (K) which is a polymerizable oligomer and / or polymer (F) and a polymerizable monomer by a conventional method.
A sheet-like prepreg which is impregnated with a resin liquid containing (G), a photopolymerization initiator (H), a thickener (J), etc. and fixed with a film such as polyethylene, polyester, PVA, etc. The prepreg is sandwiched between two thin films,
It is wound into a pipe-shaped material such as a paper tube or an iron tube as it is long, or a double-sided peelable film is laminated on one surface of a prepreg, and the film is wound outside. The thickness of the fiber-reinforced resin sheet (b) not containing the film is not particularly limited as long as it can be cured by actinic rays, but is preferably 0.5 to 3 mm.

In addition, the sheet (b) can be stored while being folded into a certain length. The obtained sheet (b) must be wrapped with a film that does not transmit light, such as an aluminum vapor deposition film, to prevent gelation.

The sheet (b) is at room temperature or 80 ° C.
It is a prepreg sheet having no liquid content, which is thickened by heating up to 30 ° C to 45 ° C.

When reinforcing / repairing the base material with the fiber-reinforced resin sheet (b), when the resin composition (a) contains a photopolymerization initiator as a polymerization initiator, the resin composition (a) is used as it is. After mixing, the composition is applied to a desired portion with a brush, a spatula, etc., and then the fixing film on one side of the fiber reinforced resin sheet (b) is peeled off before the resin composition (a) is cured. The exposed surface is shaped by a roll or the like at a low pressure of 0.1 to 10 kg / cm ^{2 so} as to remove voids between the exposed surface and the substrate. After shaping, it is cured by irradiation with actinic rays such as ultraviolet rays and visible light.

The present invention will be described in detail below with reference to examples.
In addition,% in the examples is based on weight unless otherwise specified.

Reference Example 1 (Production of Fiber Reinforced Resin Sheet (b)) 100 parts by weight of unsaturated polyester resin (Polylite CN325, manufactured by Dainippon Ink and Chemicals, Inc.) was added to an acrylic thickener (F303). (Manufactured by Nippon Zeon Co., Ltd.) and stirred sufficiently. 0.3 parts by weight of Irgacure-651 (manufactured by Ciba Geigy) as a photopolymerization initiator was further added, and after stirring and mixing, 1 inch of glass chopped strand was impregnated using an SMC manufacturing device, and the sheet was stored in a storage box while folding. I took it out. The obtained sheet was heated to 45 ° C., stored for 2 hours and thickened to prepare a fiber reinforced resin sheet. Although the sheet had tackiness, the peelability of the protective film was good, and no resin component was attached.

<Reference Example 2> (Fiber-reinforced resin sheet (b))
Production of] A sheet was prepared in the same manner as in Reference Example 1 except that the monomer component in the unsaturated polyester resin was changed from styrene monomer to β-hydroxyethyl methacrylate. The workability (film peeling property) was good due to the thickening.

Reference Example 3 (Production of Fiber Reinforced Resin Sheet (b)) Reference Example 1 except that an acrylic syrup obtained by polymerizing 30% of methyl methacrylate by bulk polymerization is used instead of the unsaturated polyester. A sheet was created in the same manner as. The workability of the obtained sheet was good.

Reference Example 4 (Production of Fiber Reinforced Resin Sheet (b)) Vinyl Ester Resin (Dicklight MUE-356
3: A sheet was prepared in the same manner as in Reference Example 1 except that Dainippon Ink and Chemicals, Inc.) was used instead of the unsaturated polyester resin. The workability of the obtained sheet was good.

Reference Example 5 (Production of Fiber Reinforced Resin Sheet (b)) A sheet was prepared in the same manner as in Reference Example 1 except that the glass chopped strand was changed to a glass chopped strand mat.

Reference Example 6 (Production of Resin Composition (a)) 100 parts by weight of unsaturated polyester resin (Polylite CN325, manufactured by Dainippon Ink and Chemicals, Inc.) was added to Aerosil 200 (produced by Nippon Aerosil Co., Ltd.). 5 parts by weight and 1 part by weight of Irgacure-651 (manufactured by Ciba Geigy) as a photopolymerization initiator were added and mixed with stirring to prepare a resin composition having no fluidity.

<Reference Example 7> (Production of resin composition (a)) Flowing in the same manner as in Reference Example 6 except that the monomer component in the unsaturated polyester resin was changed from styrene monomer to β-hydroxyethyl methacrylate. A resin composition having no property was prepared.

Reference Example 8 (Production of Resin Composition (a)) Resin composition having no fluidity in the same manner as in Reference Example 7 except that the thixotropic agent was changed from Aerosil 200 to RY200S (manufactured by Nippon Aerosil Co., Ltd.). I created a thing.

<Reference Example 9> (Production of Resin Composition (a)) 6% cobalt naphthenate was used in place of the photopolymerization initiator.
A resin composition having no fluidity was prepared in the same manner as in Reference Example 6 except that 5 parts were used.

Reference Example 10 (Production of Resin Composition (a)) Reference Example 6 except that Aerosil 200 (thixotropic agent) was omitted.
A resin composition was prepared in the same manner as in.

Example 1 The resin composition of Reference Example 6 was applied to a concrete pavement board with a spatula so that the surface unevenness was smooth. The release film on one surface of the sheet prepared in Reference Example 1 was peeled off, the peeled surface was placed, and pressure was applied by a roller so that voids would disappear. Next, the prepreg surface was irradiated with a sun lamp SSL250A (manufactured by Stanley Electric Co., Ltd.) for 20 minutes while the release film on one surface was attached, and cured.

Example 2 The procedure of Example 1 was repeated, except that Reference Example 2 was used as the fiber-reinforced resin sheet and Reference Example 7 was used as the resin composition.

Example 3 The procedure of Example 1 was repeated except that Reference Example 3 was used as the fiber reinforced resin sheet and Reference Example 8 was used as the resin composition.

Example 4 The procedure of Example 1 was repeated except that Reference Example 4 was used as the fiber reinforced resin sheet and Reference Example 8 was used as the resin composition.

Example 5 The procedure of Example 1 was repeated, except that Reference Example 5 was used as the fiber-reinforced resin sheet and Reference Example 8 was used as the resin composition.

Example 6 1 part by weight of methyl ethyl ketone peroxide was added to 100 parts by weight of the resin composition prepared in Reference Example 9 and mixed by stirring, and the mixture was applied to a concrete pavement board with a spatula so that the surface had no irregularities. . The release film on one surface of the sheet prepared in Reference Example 1 was peeled off, the peeled surface was placed on the release film, and pressure was applied by a roller so as to eliminate voids. Next, the prepreg surface was irradiated with a sun lamp SSL250A (manufactured by Stanley Electric Co., Ltd.) for 20 minutes while the release film on one surface was attached, and cured.

Comparative Example 1 The release film on one side of the fiber reinforced resin sheet prepared in Reference Example 1 was peeled off, the peeled surface was placed directly on the concrete pavement board, and pressure-bonded with a roller in the same degree as in Example 1. did. Then, with the release film on one side attached, the sun lamp SSL250A on the prepreg surface.
(Stanley Electric Co., Ltd.) was irradiated for 20 minutes to cure.

Comparative Example 2 The procedure of Comparative Example 1 was repeated, except that the fiber reinforced resin sheet prepared in Reference Example 2 was used.

<Comparative Example 3> The procedure of Comparative Example 1 was repeated except that the fiber-reinforced resin sheet prepared in Reference Example 3 was used.

<Comparative Example 4> The procedure of Comparative Example 1 was repeated except that the fiber-reinforced resin sheet prepared in Reference Example 4 was used.

<Comparative Example 5> The procedure of Comparative Example 1 was repeated except that the fiber-reinforced resin sheet prepared in Reference Example 5 was used.

<Comparative Example 6> Reference Example 10 as a resin composition
The same procedure as in Example 1 was carried out except that the one prepared in 1. was used.

<Evaluation result>

[Table 1]

<Measurement method> Presence / absence of voids; Visual observation sheet movement; Whether or not the sheet is moved when it is moved laterally while being pressed with a finger after attachment. Adhesive strength: Kenken-type adhesion test (the strength when the 4 cm x 4 cm pasted surface is pulled vertically and peeled off is converted to the strength per unit area) Fracture state: Concrete breaks when the base material breaks and sticks to the sheet ing. Interfacial peeling occurs between the concrete and the sheet, and no concrete is attached to the sheet.

[0070]

EFFECTS OF THE INVENTION The reinforcing method according to the present invention enables pressure bonding under a low pressure, and can be reinforced and repaired without leaving a gap between the standing surface and the ceiling surface of the base material. Further, since it is not necessary to heat at the time of curing, on-site construction can be easily performed outdoors.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B29K 105: 06 B29K 105: 06 B29L 7:00 B29L 7:00 9:00 9:00 F term (reference) 2E164 CA31 EA03 2E176 AA01 BB03 4F100 AG00 AK01B AK01C AK21B AK21C AK25B AK25C AK44B AK44C AK51B AK51C AL05B AT00A BA03 BA07 BA10A BA10C CA02B CA30B CA30C DG01C DG06C DG11C EH46B EJ52 GB07 JB12B JL11 4F203 AA41L AA42L AA43L AA44L AB01 AB04 AB07 AB11 AB17 AB25 AD16 AG01 AG03 DA12 DB01 DC07 DF01

Claims (6)

[Claims] 1. A polymerizable oligomer and / or a polymerizable oligomer on a substrate.
Or polymer (A), polymerizable monomer (B), thixotropic agent (C)
And a resin composition (a) containing a polymerization initiator (D) or a curing accelerator (E) as an essential component, and then a polymerizable oligomer and / or polymer (F) and a polymerizable monomer.
(G), photopolymerization initiator (H), thickener (J) and fiber reinforcement (K)
Laminate the fiber reinforced resin sheet (b) containing
Further, a reinforcing method characterized by irradiating the fiber-reinforced resin sheet with actinic rays to cure the sheet. 2. The reinforcing method according to claim 1, wherein the polymerizable oligomer and / or polymer (A) and (F) is selected from unsaturated polyester, vinyl ester, acryl, or vinyl urethane. 3. The reinforcing method according to claim 1, wherein the polymerization initiator (D) is a photopolymerization initiator. 4. The reinforcing method according to claim 1, wherein the polymerizable monomers (B) and (G) are acrylic acid ester and / or methacrylic acid ester. 5. The reinforcing method according to claim 1, wherein the fiber-reinforced resin sheet (B) is laminated before or half-cured with the resin composition (A). 6. The reinforcing method according to claim 1, wherein the base material is coated with the resin composition (a) to make it smooth, and the fiber reinforced resin sheet (b) is laminated thereon.